Cuban and Burry warn AI boom could imperil retirement portfolios

Billionaires Mark Cuban and Michael Burry warn the Nvidia-led AI surge is dangerously concentrated and could unravel with a surprise shock, risking retirement accounts heavily exposed to AI-rich equities. They cite Nvidia’s rising debt insurance costs and a lofty Shiller P/E as signs of stretched valuations, echoed by Jeremy Grantham’s bubble warning and Goldman Sachs’ projection of a 10–20% equity drawdown in the next 12–24 months. The piece advocates diversification beyond tech, including gold (even Gold IRAs), private real estate platforms like Mogul and Lightstone DIRECT, and art via Masterworks, to shield long‑term retirement funds from a potential downturn.